An excellent museum exhibit on money and banking for young children is showing at the Arizona Museum for Youth in Mesa Arizona.
The web site gives few details but my four-year-old loved it. The exhibit combines some wall art, including an improved bill by James Charles (not the Yoda one shown above though) with activities for children such as a glow-in-the-dark bank and designing paper currency with ink stamping.
The exhibit runs through January 20th. There are special Saturday events but we just went on a regular museum day.